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To analyze the example source code, take the file player.js version with hash 7bd8412 availablehere, which can be downloaded with build 1.0.41
1. Local variables
Local variables declaration to work with constants, SFU SDK, to display video and to work with client configuration
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const constants = SFU.constants; const sfu = SFU; let mainConfig; let remoteDisplay; let playState; const PLAY = "play"; const STOP = "stop"; const PRELOADER_URL="../commons/media/silence.mp3" |
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Default room configuration to use if there is no config.json file found
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const defaultConfig = {
room: {
url: "ws://127.0.0.1:8080",
name: "ROOM1",
pin: "1234",
nickName: "User1"
}
}; |
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The object should keep Websocket session data, WebRTC connection data and room data, and shoukd form HTML tags ids to access them from code.
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const CurrentState = function(prefix) {
let state = {
prefix: prefix,
pc: null,
session: null,
room: null,
set: function(pc, session, room) {
state.pc = pc;
state.session = session;
state.room = room;
},
clear: function() {
state.room = null;
state.session = null;
state.pc = null;
},
buttonId: function() {
return state.prefix + "Btn";
},
buttonText: function() {
return (state.prefix.charAt(0).toUpperCase() + state.prefix.slice(1));
},
inputId: function() {
return state.prefix + "Name";
},
statusId: function() {
return state.prefix + "Status";
},
formId: function() {
return state.prefix + "Form";
},
errInfoId: function() {
return state.prefix + "ErrorInfo";
},
is: function(value) {
return (prefix === value);
}
};
return state;
} |
4. Initialization
init() code
The init() function is called on page load and:
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connect(), SFU.createRoom() code
The connect() function is called by Publish or Play click:
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6. Playback start after session establishing
onConnected() code
The onConnected() function:
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playStreams(), SFURoom.join() code
The playStreams() function:
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stopStreams(), remoteDisplay.stop() code
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const stopStreams = function(state) {
if (remoteDisplay) {
remoteDisplay.stop();
}
} |
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onStartClick(), playFirstSound(), connect() code
- validates input fields
- in Safari browser, calls playFirstSound() before playback to automatically play incoming audio
- calls connect() function
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onStopClick(), Session.disconnect() code
The onStopClick() function:
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11. Websocket session disconnection actions
onDisconnected() code
The onDisconnected() functions:
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